Grundfos CIU 501 User Manual

English (GB)
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14. Fault finding the product
14.1 CIM/CIU 200
You can detect faults in CIM/CIU 200 by observing the status of
the two communication LEDs. See the table below and section
3.2 CIM 200 Modbus RTU.
14.1.1 LED status
CIM 200 fitted in a Grundfos booster system
CIM 200 fitted in CIU 200
Fault (LED status) Possible cause Remedy
1. LED1 and LED2 remain off when the
power supply is connected.
a) CIM 200 is fitted incorrectly in the
Grundfos product.
Ensure that CIM 200 is fitted and connected
correctly.
b) CIM 200 is defective. Replace CIM 200.
2. LED2 for internal communication is
flashing red.
a) No internal communication between
CIM 200 and the Grundfos product.
Ensure that CIM 200 is fitted correctly in the
Grundfos product.
3. LED2 for internal communication is
permanently red.
a) CIM 200 does not support the Grundfos
product connected.
Contact the nearest Grundfos company.
4. Modbus LED1 is permanently red. a) Fault in the CIM 200 Modbus
configuration.
• Check the transmission speed, switches
SW4 and SW5. If the switches are set to
"software-defined", an invalid value may
have been set via Modbus. Try one of the
preselected transmission speeds, for
example 19200 bits/s.
• Check that the Modbus address, switches
SW6 and SW7, has a valid value [1-247].
5. Modbus LED1 is flashing red. a) Fault in the Modbus communication
(fault in parity or cyclic redundancy
check).
• Check the transmission speed, switches
SW4 and SW5.
See section 5.1 Setting the Modbus
transmission speed.
• Check the parity setting, switch SW3. See
section 5.2 Setting the stop bits and the
parity bit.
• Check the cable connection between CIM
200 and the Modbus network.
• Check the termination resistor settings,
switches SW1 and SW2.
See section 5.4 Termination resistor.
Fault (LED status) Possible cause Remedy
1. LED1 and LED2 remain off when the
power supply is connected.
a) CIU 200 is defective.
Replace CIU 200.
2. LED2 for internal communication is
flashing red.
a) No internal communication between
CIU 200 and the Grundfos product.
• Check the cable connection between the
Grundfos product and CIU 200.
• Check that the individual conductors
have been fitted correctly.
• Check the power supply to the Grundfos
product.
3. LED2 for internal communication is
permanently red.
a) CIU 200 does not support the Grundfos
product connected.
Contact the nearest Grundfos company.
4. Modbus LED1 is permanently red. a) Fault in the CIM 200 Modbus
configuration.
• Check the transmission speed, switches
SW4 and SW5. If the switches are set to
"software-defined", an invalid value may
have been set via Modbus. Try one of the
preselected transmission speeds, for
example 19200 bits/s.
• Check that the Modbus address,
switches SW6 and SW7, has a valid
value [1-247].

Grundfos CIU 501 Specifications

General

Brand	Grundfos
Model	CIU 501
Category	Controller
Language	English